/*
 * P3DMRgbFile.java Created on Dec 14, 2007 by M.C.Boulahiya
 */
package model;

/**
 * @author of modifications M.C.Boulahiya
 *
 */

/*
 * $RCSfile: RgbFile.java,v $
 *
 * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
 * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
 * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
 * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
 * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
 * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
 * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
 * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or
 * maintenance of any nuclear facility.
 *
 * $Revision: 1.4 $
 * $Date: 2007/02/09 17:20:10 $
 * $State: Exp $
 */

import java.io.BufferedInputStream;
import java.io.InputStream;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.awt.image.DataBuffer;
import java.awt.image.DataBufferByte;
import java.awt.image.ComponentColorModel;
import java.awt.image.WritableRaster;
import java.awt.color.ColorSpace;
import java.awt.Transparency;

class P3DMRgbFile extends BufferedInputStream {

	// Header data
	short dimension;
	short xSize;
	short ySize;
	short zSize;

	String filename;

	private static final int DEBUG = 0;


	short getShort() throws IOException {
		int t1 = (short)read();
		if (t1 == -1) throw new IOException("Unexpected EOF");
		int t2 = (short)read();
		if (t2 == -1) throw new IOException("Unexpected EOF");
		return (short)((t1 << 8) | t2);
	} // End of getShort()


	byte getByte() throws IOException {
		int t = read();
		if (t == -1) throw new IOException("Unexpected EOF");
		return (byte)t;
	} // End of getByte


	int getInt() throws IOException {
		int ret = 0;
		for (int i = 0 ; i < 4 ; i++) {
			int t = read();
			if (t == -1) throw new IOException("Unexpected EOF");
			ret = (ret << 8) | t;
		}
		return ret;
	} // end of getInt


	public BufferedImage getImage() throws IOException {
		short magic = getShort();

		if (magic != 474) throw new IOException("Unrecognized file format.");

		byte storage = getByte();

		if (storage != 0)
			throw new IOException("RLE Compressed files not supported");

		byte bpc = getByte();
		dimension = getShort();
		xSize = getShort();
		ySize = getShort();
		zSize = getShort();
		int pixMin = getInt();
		int pixMax = getInt();
		skip(84l);
		int colorMap = getInt();

		if ((DEBUG & 1) != 0) {
			System.out.println(filename + ":");
			System.out.println("  bpc = " + bpc);
			System.out.println("  dimension = " + dimension);
			System.out.println("  xSize = " + xSize);
			System.out.println("  ySize = " + ySize);
			System.out.println("  zSize = " + zSize);
			System.out.println("  pixMin = " + pixMin);
			System.out.println("  pixMax = " + pixMax);
			System.out.println("  colorMap = " + colorMap);
		}

		if ((pixMin != 0) || (pixMax != 0xff) || (colorMap != 0) || (bpc != 1))
			throw new IOException("Unsupported options in file");

		skip(404l);

		ComponentColorModel cm = null;
		if (zSize == 1) {
			// Black and White image
			ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);

			int[] nBits = {8};
			cm = new ComponentColorModel(cs, nBits, false, false,
					Transparency.OPAQUE, 
					DataBuffer.TYPE_BYTE);

		} else if (zSize == 2) {
			// Black and White image with alpha
			ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_GRAY);

			int[] nBits = {8, 8};
			cm = new ComponentColorModel(cs, nBits, true, false,
					Transparency.TRANSLUCENT,
					DataBuffer.TYPE_BYTE);

		} else if (zSize == 3) {
			// RGB Image
			ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);

			int[] nBits = {8, 8, 8};
			cm = new ComponentColorModel(cs, nBits, false, false,
					Transparency.OPAQUE,
					DataBuffer.TYPE_BYTE);

		} else if (zSize == 4) {
			// RGBA Image
			ColorSpace cs = ColorSpace.getInstance(ColorSpace.CS_sRGB);

			int[] nBits = {8, 8, 8, 8};
			cm = new ComponentColorModel(cs, nBits, true, false,
					Transparency.TRANSLUCENT,
					DataBuffer.TYPE_BYTE);
		} else {
			throw new IOException("Unsupported options in file");
		}

		WritableRaster r = cm.createCompatibleWritableRaster(xSize, ySize);
		BufferedImage bi = new BufferedImage(cm, r, false, null);

		int t;
		byte image[] = ((DataBufferByte)r.getDataBuffer()).getData();
		for (short z = 0 ; z < zSize ; z++) {
			for (int y = ySize - 1 ; y >= 0 ; y--) {
				for (short x = 0 ; x < xSize ; x++) {
					t = read();
					if (t == -1) throw new IOException("Unexpected EOF");
					image[y * (xSize * zSize) + (x * zSize) + z] = (byte)t;
				}
			}
		}

		return bi;
	} // End of getImage


	public P3DMRgbFile(InputStream s) {
		super(s);
	} // End of P3DMRgbFile(URL)
	
}//End of class P3DMRgbFile

//End of file P3DMRgbFile.java